Name two minerals in your set that have two directions of cleavage at right angles, and the third direction is fracture.

A steel specimen is tested in tension. The specimen is 1" wide by 0.5" thick in the test region. By monitoring the stresses from the testing machine, it was found that the specimen yielded at a stress of 72 ksi and fractured at 96 ksi. (a). Determine the tensile loads at yield and at fracture

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Which of the following parameter represents principal stresses: T_a none of the available option O_X O_y 0_a